9 Appendix
9.3 Glossary
XI/ON: XNE-GWBR-2ETH-IP
09/2011 MN05002007Z-EN
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GND
Abbreviation of ground (potential "0").
Ground
Expression used in electrical engineering to describe an area whose electrical potential is equal to zero
at any given point. In neutral grounding devices, the potential is not necessarily zero, and one speaks of
the ground reference.
Ground connection
One or more components that have a good and direct contact to earth.
Ground reference
Potential of ground in a neutral grounding device. Unlike earth whose potential is always zero, it may
have a potential other than zero.
Hexadecimal
System of representing numbers in base 16 with the digits 0... 9, and further with the letters A, B, C, D,
E and F.
Hysteresis
A sensor can get caught up at a certain point, and then "waver" at this position. This condition results in
the counter content fluctuating around a given value. Should a reference value be within this fluctuating
range, then the relevant output would be turned on and off in rhythm with the fluctuating signal.
I/O
Input/output.
Impedance
Total effective resistance that a component or circuit has for an alternating current at a specific
frequency.
Inactive metal components
Conductive components that cannot be touched and are electrically isolated from active metal compo-
nents by insulation, but can adopt voltage in the event of a fault.
Inductive coupling
Magnetic inductive couplings occur between two cables through which an electrical current is flowing.
The magnetic effect caused by the electrical currents induces an interference voltage. Typical sources
of interference are for example, transformers, motors, parallel-routed network and HF signal cables.
Intelligent modules
Intelligent modules are modules with an internal memory, able to transmit certain commands (e. g.
substitute values and others).
IP
Abbreviation for Internet-Protocol, protocol for the packet-oriented and connectionless transport of data
packets from a transmitter to a receiver crossing different networks.
Lightning protection
All measures taken to protect a system from damage due to overvoltages caused by lightning strike.
Low impedance connection
Connection with a low AC impedance.
LSB
Least Significant bit
